/***
 * Copyright 2002-2010 jamod development team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ***/

package net.wimpi.modbus.util;

import net.wimpi.modbus.Modbus;

/**
 * Provides an atomic integer.
 * <p/>
 * 
 * @author Dieter Wimberger (wimpi)
 * @version @version@ (@date@)
 */
public class AtomicCounter {

	private int m_Value;

	/**
	 * Constructs a new <tt>AtomicInteger</tt>.
	 */
	public AtomicCounter() {
		m_Value = 0;
	}// constructor

	/**
	 * Constructs a new <tt>AtomicInteger</tt> with a given initial value.
	 * 
	 * @param value
	 *            the initial value.
	 */
	public AtomicCounter(int value) {
		m_Value = value;
	}// constructor

	/**
	 * Increments this <tt>AtomicInteger</tt> by one.
	 * 
	 * @return the resulting value.
	 */
	public synchronized int increment() {
		if (m_Value == Modbus.MAX_TRANSACTION_ID) {
			m_Value = 0;
		}
		return ++m_Value;
	}// increment

	/**
	 * Returns the value of this <tt>AtomicInteger</tt>.
	 * 
	 * @return the actual value.
	 */
	public synchronized int get() {
		return m_Value;
	}// get

}// class AtomicCounter
